公开(公告)号：USD325638S

公开(公告)日：1992-04-21

申请号：US377197

申请日：1989-07-10

申请人： Sharon S. Sloat ,  Carol A. Ziel

设计人： Sharon S. Sloat ,  Carol A. Ziel

公开(公告)号：US4205955A

公开(公告)日：1980-06-03

申请号：US946800

申请日：1978-09-28

申请人： Sharon S. Sloat

发明人： Sharon S. Sloat

IPC分类号： G01N33/18 ,  G01N31/22

CPC分类号： G01N33/1853 ,  Y10T436/25125

摘要： A liquid sample is prepared for measurement of its calcium plus magnesium hardness by adding to the sample an aluminum chelate, preferably aluminum disodium (cyclohexylenedinitrilo) tetra-acetic acid, while maintaining the pH of the sample in the range between about 5 and 8. Interference by iron or copper ions is thereby substantially eliminated without using poisonous substances. The pH of the sample is then raised to between about 9.5 and 11 to insolubilize aluminum ions; a magnesium chelate is added to exchange calcium ions, releasing an equivalent number of magnesium ions; and a dye indicator that forms a colored complex with magnesium ions is added. The calcium plus magnesium hardness is then measured by titration or spectrophotometrically.

摘要翻译： 通过向样品中加入铝螯合物，优选铝二钠（环己烯二亚乙基）四乙酸，同时将样品的pH保持在约5-8范围内，制备液体样品用于测量其钙加镁硬度。干扰 因此，通过铁或铜离子可以基本上消除而不使用有毒物质。 然后将样品的pH升高至约9.5和11之间以使铝离子不溶; 加入镁螯合物来交换钙离子，释放出相当数量的镁离子; 并加入与镁离子形成着色络合物的染料指示剂。 然后通过滴定或分光光度法测量钙加镁硬度。